Towers
American Tract Society Bible Dictionary [1]
Were erected not only in the outer walls and on the heights within cities, Judges 9:47-49 Psalm 48:12 Luke 13:4 , but along the frontiers of a country, at points where the approach of an enemy could be descried at a distance, Judges 9:17 Isaiah 21:6-9 Ezekiel 33:2-6 . A tower afforded a refuge to the surrounding inhabitants, in case of invasion; and often, when most of a city was subdued, the tower or citadel remained impregnable.
So God is a strong and safe protector of his people, Psalm 18:2 61:8 Proverbs 18:10 . A slight tower or look-out was often erected for the keeper of a vineyard or flock, 2 Chronicles 26:10 Isaiah 5:2 Micah 4:8 Matthew 21:33; and travelers in Palestine see them in use at this day.
Easton's Bible Dictionary [2]
Genesis 11:4Genesis 35:21Judges 8:9,17Song of Solomon 4:4Ezekiel 29:10Zechariah 14:10Luke 13:42 Chronicles 26:9Psalm 48:12Isaiah 5:2Matthew 21:33
Fausset's Bible Dictionary [3]
Used as parts of city walls, or separate, as EDAR, LEBANON, etc., to defend wells, flocks, or commerce (2 Chronicles 26:10; 2 Chronicles 27:4; Genesis 35:21; Micah 4:8). Also attached to vineyards, as lodges for the keepers, wherein they could watch against the depredations of man or beast (Isaiah 5:2; Matthew 21:33; Mark 12:1).
